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Performance of a hydrophobic heat and moisture exchanger at different ambient temperatures
1Servizio di Anestesia e Rianimazione, IRCCS Ospedale Maggiore, Milano, Italy.
Objective:
To evaluate the effect of different room temperatures on hydrophobic heat and moisture exchangers (HME) humidifying capability and efficiency.
Methods:
Stock HMEs were tested in vitro using an already described test model, with separation of inspiratory and expiratory gas. Absolute humidity (AH) was measured by means of dry-wet dual thermocouple, and HME efficiency was computed as the ratio between expired to inspired AH, at room temperature of 20 and 26 degrees C.
Results:
Inspired gas temperature and AH were significantly higher at 26 than at 20 degrees C; since expired AH remained substantially unchanged, HME efficiency was also higher in warmer environment.
Conclusions:
Hydrophobic HMEs appear to be affected by room temperature, increasing their humidifying ability and their efficiency with its rise.
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